iframe {
  width: 85%;
  border: none;
}

.top_nav {
  display: flex;
  justify-content: space-between;
  height: 3rem;
  padding: 5px 0;
  background-color: #fff;
  box-shadow: 0 1px 3px 0 rgba(204, 204, 204, 0.5);
}

.top_nav {
  border-bottom: 1px solid #f2ecec;
}

.top_nav div {
  width: 20rem;
  display: flex;
  justify-content: center;
  align-items: center;
}

.top_nav ul {
  display: flex;
  align-items: center;
}

.top_nav li {
  margin-right: 0.5rem;
  border: 1px solid #e8e9e9;
  border-radius: 4px;
  width: 2rem;
  height: 2rem;
  background-size: 70% 70%;
  background-position: center center;
  background-repeat: no-repeat;
}

.top_nav li:first-child {
  background-image: url(../images/msg.png);
}

.top_nav li:nth-child(2) {
  background-image: url(../images/update.png);
}

.top_nav li:nth-child(3) {
  background-image: url(../images/exit.png);
}

.top_nav li:nth-child(4) {
  background-image: url(../images/user.png);
  background-size: 100% 100%;
}

.top_nav li:last-child {
  width: 50px;
  border: none;
  font-size: 0.9rem;
  color: #7d7ea2;
  margin-left: 0.5rem;
  line-height: 2rem;
}

.left {
  margin-left: 2rem;
  color: #3B82FF;
  font-weight: 400;
  font-size: 16px;
}

.left img {
  width: 7rem;
  margin-right: 1.5rem;
}

.box_content {
  display: flex;
  justify-content: center;
  margin-top: 1.5rem;
}

.left_nav {
  display: inline-flex;
  flex-direction: column;
  width: 10rem;
  margin-left: 1.5rem;
}

.welcome {
  position: relative;
  background-image: url(../images/welcome.png);
  padding: 0.5rem 0 0 1rem;
  background-size: 100% 100%;
  height: 3rem;
  color: #fff;
  border-radius: 8px;
  margin-bottom: 1rem;
}

.manage_list {
  min-width: 120px;
  position: relative;
  padding: 10px;
  background: #fff;
  border-radius: 4px;
  height: 75vh;
  box-shadow: 0 1px 4px 0 rgba(0, 0, 0, 0.06);
}

.link {
  display: flex;
  align-items: center;
  cursor: pointer;
  font-size: 1rem;
  height: 50px;
  color: #5F727F;
  margin: 0 auto;
}

.link i {
  padding-left: 0.75rem;
  font-size: 1.5rem;
  transition: all 0.3s ease;
}

.link:hover {
  color: #3b82ff;
}

.active {
  color: #3b82ff;
}